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 Outline of the Chapter
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<H2>Outline of the Chapter</H2>
This chapter presents the basic elements of the Internet, 
sockets, for the purpose of building distributed applications 
(particularly client-server applications) while detailing the problems 
in designing communications protocols.<BR>
<BR>
The first section briefly explains the Internet, its 
addressing system and its main services.<BR>
<BR>
The second section illustrates communications through sockets between
different Objective CAML processes, both local and remote.<BR>
<BR>
The third section describes the client-server model, while 
presenting server programs and universal clients.<BR>
<BR>
The fourth section shows the importance of communications protocols
for building network services.<BR>
<BR>
This chapter is best read after the chapters on systems programming
(Chapter&nbsp;<A HREF="index.html#chap-PS">18</A>) and on concurrent programming (Chapter&nbsp;<A HREF="index.html#chap-PC">19</A>).<BR>
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